Improvement in wax-thread sewing-machines



UNITED STATES GFFICE.

ALEXANDER TITTMAN, OF EVANSVILLE, INDIANA.

IMPROVEMENT IN WAX-THREAD SEWING-MACHINES.

To all whom it may concern:

Be it known that I, ALEXANDER TITTMAN, of Evansville, in the -.county of Vanderburg and State of Indiana, have invented certain new and useful Improvements in ,Wax-End Sewing-Machine and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanyin g drawing and to the letters of reference marked thereon which form a part of this specification.

My invention is intended as an improvement upon what is known as the Butterfield machine for sewing leather, patented July 4, 1854, and April 8, 1.862 5 and it consists in the construction and arrangement of parts for operating the awl, the presser-foot, the threadguide, and the needle-carriage,- as hereinafter described.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to describe its construction and operation, referring to the annexed drawing, in which- Figure 1 is a side elevation Fig. 2, a bottom View; and Fig. 3, a front view of the machine with my improvements added thereto; Figs. 4, 5, 6, and 7 represent the various cams.

The machine upon which my invention is an improvement being so well known, I do not deem it necessary to describe any more of the same than what is required for a proper understanding of this case.

For further description of the machine and its operation I refer to the two patents above mentioned.

A represents the main drivingshaft passing horizontally through the bent standard B, and the front end extending into the head 0, attached to or formed upon the frdnt end of the standard. Upon the front end of the shaft A, within the head 0, is attached a plate, D, having upon its front side a crank or wrist pin, a. This pin works in a cam-block, D attached to the awl-carrying bar E for the purpose of operating the same. The curve of this cam, as shown in Fig. 4, is nearly a half circle, struck with a radius equal to the dis tance between the center of the craukpin a and the center of the shaft A, the side where the crank-pin runs when pushing the awl through the leather being so nearly on a straight line as to avoid a sharp corner at at. The result of the operation of this cam in the movement of the awl during one revolution is, the first quarter down, the second quarter up, and the remainin g one-half stationary. On the circumference of the crank-plateD is formed the cam D as shown in Fig. 5, which lifts the presser-foot by comingin contact with an arm connected with the presser-foot bar H, said arm having a roller, b, bearing against the cam to avoid undue friction. down during three-fourths of a revolution and lifts it exactly at the time when the cam 1) commences its upward motion to operate the feeding mechanism, as hereinafter described.

On the back of the plateD is another crankpin, (1, which works against an arm, D pivoted to the head 0 and operating the thread-guide G. This arm is formed on its inner edge with two curves, 3 y, at different distances from the center of the shaft A, as shown in Fig. 6, and is connected at its lower end with the shaft of the thread-guide G. The operation of the arm D is to swing the thread-guide around just when the needle or hook is going down and as the awl is descending. The cams I) and D are both of the form shown in Fig. 7. The cam 1) moves the needle-carriage by means of a bar, N, placed over said cam and extending down below the sewing-machine table, where its lower end is, by a rocking lever, O, or other suitable means, connected with the carriage so that the motion of the same will be horizontally back and forth on its guide-rods. The cam D moves the needle and cast-off up and down by means of abar, M, placed over said cam, and which also extends below the sewing-machine table and its lower end by a suitable rocking-lever, 'P, is connected with the needle-bar, the needle-bar operating the cast-off at the proper time. Both of these cams operate their respective bars the first quarter up, the second stationary, third down, and fourth stationary. 5 1 represents the needle-carriage guided by means of three horizontal pins 0 0, upon which it moves back and forth, thus reducing the friction caused by its movement to the smallest possible amount. J represents the presser-spring fastened by a set-nut on a bolt upon the standard B and its front end operating on the presser-foot bar H. The rear curved end of The cam D leaves the foot the spring J rests upon a saddle, f, which is movable back and forth from the tightening screw, whereby the operator can quickly and precisely suit the pressure to the nature of the goods being sewed. K represents the cast-01f which consists'simply of a straight rod with its end turned up andshaped to fit along the side of the needle. Thisis passed through the end of the bar L horizontally, said bar being sawed through or split for a suitable distance, thereby forming an efficient clamp with the screw h. This device is easily adjusted by merely turning the cast-01f rightside up close to the needle and pressing it against the same and then tightening the clam p-screw h,

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

The driving shaft having-the cams D and D and disk D with cam D and pins a: d, when combined with and operating the awlcarrier through the cam-block D, the threadguide through the pivoted curved arm D and the needle, and cast-ofl, and carriage, through the links NM and connecting mechanism-all substantially as and for the purpose specified.

In testimony-that'I claim the foregoing as my own I affix my signature in presence of two witnesses.

ALEXANDER TITTMAN.

Witnesses: F. S. ZUMSTEIN, O. WUNDERLICH,

City Marshal. 

